Quick answer
Kazuki is a boy name.
Meaning and history
From Japanese 一 ( kazu ) meaning "one" or 和 ( kazu ) meaning "harmony, peace" combined with 輝 ( ki ) meaning "brightness", 希 ( ki ) meaning "hope" or 樹 ( ki ) meaning "tree", as well as other combinations of kanji characters.
Notes and context
Usage: japanese | Japanese Hiragana: かずき; Japanese Katakana: カズキ